Fire-door.



F. W. FRANK.

Patented Dec. 8, 191$ 2 SHEETS-SHEETI &.

'F. W. FRANK.

FIRE DOOR.

APPLICATION FILED NOVK 1911,

1,1 20, 1 89. Patented Dec. 8. 1914.

2 Tv'HEETS SHEET 2 Zluvemtoz W E W 17/61/24 i memes FREDRIQK WILLIAM FRANK. OF CHICAGO, ILLINOIS.

FIRE-DOOR.

Specification of Letters Patent.

Patented Dec. 8, jets.

Application filed November 11, 1911. Serial No. 659.773.

7}, (/71 whom it rot/7,1 concern Be it kno n that, I, FREDRICK \Vmusn l'nxxn'. a citizen of the lfnitcd States. residing; at Chicago. in the countv of Cook and Htatioflllinois. have invented a new and useful Improvement in FireJJoors, of which the following aspecification.

This invention relates to fire doors, and it especially dcsigmed, for use in connection with locomotives, or large engine furna es. although the door can be adapted for use in connection with furnaces of various types.

The object of the intention to provide a fire door. which can be easily opened, and which will automatically close. the door bein; formed in upper and lower sections suitably connected together, and the upper section lifting vertically and being heavier than the lower section the weight of the upper section automatically lifting the lower section into closed position when the doors are released.

The invention consists of the novel features of construction hereinafter fully described, pointed'out in the claim and shown in the accompanying drawings. in-which,

Figure 1 is a face view of the door in closed position. Fig. 2 is a side elevation a portion of the furnace frame being in section. Fig. 3 is a horizontal section taken upon the line 3-3 of Fig. 2. Fig. 4- is a vertical section through'the door, the sections being in partly open position. Fig. 5 is a detail view. a portion of the frame beinL' in section.

In these drawings. 1 represents the front wall of the furnace or fire box. provided with the usual coal opening 2. Fitting around this opening is a frame 3. hich frame hinged atone end shown at 4. and provided with a suitable atch at the opposite end which engages a keeper 6. carried by the wall 1. This frame swings in a horizontal plane. and when thrown back the opening 2. is cleared of all obstruction thus permitting ready entrance for the purpose of cleaning out. This frame is in the form of a rectangular box the ends of which project in advance-of the sides and are on positely and obliquely cut away thereby forming front oppositely inclined edges 7 and 8, the upper edge 7, being of the greater length and inclining outwardly and downwardly, while the shorter edge 8, slants outwardly and upwardly. The corners of the frame are provided with curved faces'9, so.

that there will he no angles or pockets in which coal can collect.

Formed at the front corners of the frame. are suitable brackets 1), which form bearings for pintles 11, of the door sections 12 and 1 the s..tion 12 being the upper section and having a greater width and surface area and therefore being heavier than the section 13. These door sections rest, respectively upon the edges 7 and 8, of the ends of the frame 3, and as shown in Fig. 3. these edges are beveled. and the door sections are beveled also to fit said edges and are also provided with flanges 14. which lap over the sides of the frame ends. To operatively connect these door sections in unison. I provide; a pivoted link 15, upon a projcctirnc end portion of the upper pintle 1 of the door 12. said projecting portion beinL preferably formed on the left-hand 'side of the lower pintle 11 and upon the same side pivoted midway its ends a link 16, the inncr end of the link 16 is pivotally com'iected to the link 15 by means of a link i s; adjustment of'whichis provided for by means of a suitable turnbuckle 1-). To the other end of the link 16. is pivoted a link 17, which is pivotallv connected to and supports a foot trcadle 20.

It will be oi vious that by deprc 'ng the inner end of the treadle. thelink i? will be drawn down and thc link 16 rocked upon the lower pintlc. As the links '16 and'15 are fixed by suitable s t screws to the pintles upon which the"; are mounted the roclc ing of the link I will swing the door section 13 outwardlv and downwardlv. At

the same time the link 18 will he lifted. thus liftint! the link 13 and swinging the door section 172 outwardly and upwardly. When pressure upon thc'fo t trr-adle is removed the door section 12 will drop back of its own weight. being larger and heavier than the lower section 13. thus forcin; the link 13 downwardly and inwardly, returning the link i to its normal position as shown in Fig. 2, thus losing the lower door section 13, bothsections being operated by gravity although moving in opposite directions.

In order to permit adjustment on account of wear, I have provided an adjustablehearing 21 for the intles 11, said hearing being held in the bifurcation of the bracket 10.

In order to permit the doors to be opened readily against the interior draft of the furnacc, said doors are formed with hollow spaces 22 therein, said spaces communicat ing through suitable openings 23 with the interior of the furnace. It will be noted therefore that as soon as the doors commence to open the exterior air can fiow into the spaces 22 and through the openings 23 into the furnace, thus overcoming the pull upon the doors of the inner draft, or in other words relieving the outer faces of the door of exterior air pressure since they have 1,12o,1se

been opened sufiiciently to permit the outside air to pass into the spaces 22.

What I claim is:

A fire box closure comprising a frame adapted to swing upon a vertical axis, of doors arranged at an angle to each other and hinged in said frame, said doors swinging upon horizontal axes, means for causing said doors to swing in unison, the upper door being of greater dimensions and Weight than the lower door and falling into closed position by gravity, the two doors being operatively connected.

FREDRICK WILLIAM FRANK.

Witnesses:

JOHN Gmeous, THOMAS GAnrvAN. 

